A049954 a(n)=a(1)+a(2)+...+a(n-1)+a(m), where m=n-1-2^p and 2^p<n-1<=2^(p+1).

1, 2, 2, 6, 13, 25, 51, 102, 208, 411, 823, 1646, 3296, 6599, 13210, 26446, 52943, 105785, 211571, 423142, 846288, 1692583, 3385178, 6770382, 13540815, 27081736, 54163675, 108327762, 216656347, 433314344, 866631991, 1733270593